At one point, Masipa said: "I continue to explain why most witnesses got their facts wrong."
Masipa also said she was disregarding text messages between Steenkamp and Pistorius that had been entered as evidence. Prosecutors had submitted text messages that showed tension between them while the defense submitted messages that indicated mutual affection. That evidence, the judge said, doesn't prove anything.
"Normal relationships are dynamic and unpredictable most of the time, while human beings are fickle," she said.
Pistorius faced 25 years to life in prison if convicted of premeditated murder for fatally shooting Steenkamp through a toilet cubicle door in his home in the pre-dawn hours of Feb. 14, 2013. He also faced years in jail if found guilty of murder without pre-planning, or of negligent killing. Pistorius could also be acquitted if Masipa believes he made a tragic error and acted reasonably.